Rust

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Rust

  1. 1. How and why does rust form? Is this a chemical or physical reaction?
  2. 2. Rusting Iron <ul><li>Rust happens quite naturally, when iron contacts air. The air is about 1/5 oxygen gas. </li></ul>
  3. 3. Rusting <ul><ul><li>the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water </li></ul></ul><ul><ul><li>The rusting of iron is an example of oxidation. </li></ul></ul>
  4. 4. OXIDATION <ul><li>The combining of a material with oxygen </li></ul><ul><ul><li>An example of a very common and very important type of chemical change </li></ul></ul><ul><ul><li>Oxidation is a chemical reaction is which electrons are lost. </li></ul></ul>
  5. 5. Rust is the chemical combination of iron with oxygen 4Fe + 3O 2 ---> 2 Fe 2 O 3 <ul><li>In this reaction, iron combines with oxygen in air to form iron oxide. Iron oxide is a reddish brown compound that is commonly known as rust. </li></ul>
  6. 6. Molecular structure of Rust
  7. 7. Experiment <ul><li>Set up three beakers </li></ul><ul><ul><li>Label one WATER, one VINEGAR, and one NOTHING. </li></ul></ul><ul><li>Add approximately 50 ml of water to one beaker and approximately 50 ml of vinegar to another. </li></ul><ul><li>Place a small piece of iron wool into each beaker. </li></ul><ul><ul><li>For the beakers with liquid, stretch out the wool and place it in the beaker so some of the wool is below the surface of the liquid and some is above the surface of the liquid. </li></ul></ul><ul><li>Observe the beakers over three days. </li></ul><ul><ul><li>If you observe changes in the iron wool, are the changes the same below the liquid, at the surface of the liquid and above the liquid? </li></ul></ul><ul><li>Record observations and discuss the results </li></ul>

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